<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
<script>
    let str='hello';
    let pattern =/o/;
    //exce是正则对象的方法
    let result =pattern.exec(str);
    console.log(result);
</script>
</body>
</html>